#include <vpMomentBasic.h>

Inheritance diagram for vpMomentBasic:

Public Member Functions
	vpMomentBasic ()

void	compute ()

const std::vector< double > &	get () const

double	get (unsigned int i, unsigned int j) const

const char *	name () const

const vpMomentObject &	getObject () const

void	linkTo (vpMomentDatabase &moments)

void	update (vpMomentObject &object)

Protected Member Functions
vpMomentDatabase &	getMoments ()

Protected Attributes
std::vector< double >	values

Detailed Description

This class defines the 2D basic moment $m_{ij}$ . This class is a wrapper for vpMomentObject wich allows to use it as a moment. This enables all common operations such as adding to a vpMomentDatabase.

In the case of a dense object O, 2D basic moments are defined by:

$m_{ij} = \int \int_{O} x^j y^j dx dy$

In the case of a discrete set of n points, the basic moments are defined by

$m_{ij} = \sum_{k=1}^{n} x_k^j y_k^j$

The selection of a dense or discrete object is done in vpMomentObject. The maximum order of vpMomentBasic is the same as that of vpMomentObject (ie: $i+j \leq$ vpMomentObject::getOrder).

Note that in the continuous case, the basic moment $m_{00}$ corresponds to the surface $a$ of the object. In the discrete case, it is the number of discrete points $n$ .

Definition at line 74 of file vpMomentBasic.h.

Constructor & Destructor Documentation

vpMomentBasic::vpMomentBasic ( )

Default constructor.

Definition at line 47 of file vpMomentBasic.cpp.

Member Function Documentation

void vpMomentBasic::compute ( )

virtual

Dummy function. Everything is already done in object.

Implements vpMoment.

Definition at line 76 of file vpMomentBasic.cpp.

const std::vector< double > & vpMomentBasic::get ( ) const

Retrieve all moments of all orders computed. vpMomentBasic::get()[j*order+i] refers to moment $m_{ij}$ .

Returns: all computed moments.

Same behaviour as vpMomentObject.

Definition at line 57 of file vpMomentBasic.cpp.

References vpMomentObject::get(), and vpMoment::getObject().

double vpMomentBasic::get	(	unsigned int	i,
		unsigned int	j
	)		const

Gets the desired moment using indexes.

Parameters

i	: first index of the 2D moment.
j	: second index of the 2D moment.

Returns: $m_{ij}$ moment.

Same behaviour as vpMomentObject.

Definition at line 69 of file vpMomentBasic.cpp.

References vpMomentObject::get(), and vpMoment::getObject().

vpMomentDatabase& vpMoment::getMoments ( )

inlineprotectedinherited

Returns the linked moment database.

Returns: the moment database

Definition at line 119 of file vpMoment.h.

Referenced by vpMomentArea::compute(), vpMomentGravityCenterNormalized::compute(), vpMomentCentered::compute(), vpMomentAreaNormalized::compute(), vpMomentCInvariant::compute(), and vpMomentAlpha::compute().

const vpMomentObject& vpMoment::getObject ( ) const

inlineinherited

void vpMoment::linkTo ( vpMomentDatabase & data_base )

inherited

Links the moment to a database of moment primitives. If the moment depends on other moments, these moments must be linked to the same database.

Attention: Two moments of the same class cannot be stored in the same database
#include <visp/vpMomentObject.h>

#include <visp/vpPoint.h>

#include <visp/vpMomentGravityCenter.h>

#include <visp/vpMomentDatabase.h>

#include <visp/vpMomentCentered.h>

int main()

{

vpPoint p;

std::vector<vpPoint> vec_p;

p.set_x(1); p.set_y(1); // coordinates in meters in the image plane (vertex 1)

vec_p.push_back(p);

p.set_x(2); p.set_y(2); // coordinates in meters in the image plane (vertex 2)

vpMomentObject obj(2);

obj.setType(vpMomentObject::DISCRETE); // Discrete mode.

obj.fromVector(vec_p); // Init the dense object with the polygon

vpMomentDatabase db;

vpMomentGravityCenter G; // declaration of gravity center

vpMomentCentered mc; // mc containts centered moments

G.linkTo(db); //add gravity center to database

mc.linkTo(db); //centered moments depend on gravity, add them to the

//database to grant access

G.update(obj); // specify the object for gravity center

mc.update(obj); // and for centered moments

G.compute(); // compute the moment

mc.compute(); //compute centered moments AFTER gravity center

return 0;

}

Parameters

data_base : database of moment primitives.

Definition at line 103 of file vpMoment.cpp.

References vpException::memoryAllocationError, and vpMoment::name().

Referenced by vpMomentCommon::getAlpha(), vpMomentCommon::getMu3(), vpMomentCommon::getSurface(), and vpMomentCommon::vpMomentCommon().

const char* vpMomentBasic::name ( ) const

inlinevirtual

Moment name.

Implements vpMoment.

Definition at line 84 of file vpMomentBasic.h.

void vpMoment::update ( vpMomentObject & moment_object )

inherited

Updates the moment with the current object. This does not compute any values.

Parameters

moment_object : object descriptor of the current camera vision.

Definition at line 120 of file vpMoment.cpp.

Member Data Documentation

std::vector<double> vpMoment::values

protectedinherited

Definition at line 114 of file vpMoment.h.

Referenced by vpMomentArea::compute(), vpMomentGravityCenterNormalized::compute(), vpMomentCentered::compute(), vpMomentGravityCenter::compute(), vpMomentAreaNormalized::compute(), vpMomentCInvariant::compute(), vpMomentAlpha::compute(), vpMomentCentered::get(), vpMomentGravityCenter::get(), vpMomentCInvariant::getMomentVector(), vpMomentCentered::set(), vpMomentAlpha::vpMomentAlpha(), vpMomentArea::vpMomentArea(), vpMomentAreaNormalized::vpMomentAreaNormalized(), vpMomentCInvariant::vpMomentCInvariant(), and vpMomentGravityCenter::vpMomentGravityCenter().

Public Member Functions

Protected Member Functions

Protected Attributes

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation